Astronomers mistook a car SpaceX blasted into space years ago as an asteroid. The brief mix-up highlights the sometimes difficult pursuit of tracking deep-space objects.

The mix-ups highlight difficulties with tracking objects in deep space — a problem exacerbated by the growing number of human-made objects getting jettisoned into the ether. Objects traversing ...

Scientists have found two unusual objects in deep space. One is so big it could fit 21 Jupiters inside but is neither a star nor a planet.